Understand I/O path in linux kernel

Hi All, I am looking to understand I/O path in linux kernel. Here is following things I have tried to understand it, 1. try to understand vfs_write 2. then move into fs specific write call 3. I thought then after the call goes to I/O scheduler. 4. then low-level device driver eg. SCSI, ide 5. these drivers read/write sectors. These are above I/O path I understood at a very high level. Please correct me if somewhere I misunderstood. I want to get an understanding of how blocks get read and write from a disk. Please suggest me something that will help me to understand and visualize data path in linux kernel. --- Jitendra